Rock-drilling machine.



No. 819,756. PATENTED MAY, s, 1906.

H. HELLMAN & L. c. BAYLES.

ROCK DRILLING MACHINE.

APPLICATION FILED AUG.12, 1904.

imrrizn STATES PATENT OFFICE.

HENRY HELLMAN AND LEWIS CONDIGT BAYLES, OF JOHANNESBURG.

TRANSVAAL.

ROCK-DRILLIN MAQ INE.

No. siavse.

Specification of Letters Patent;

Ltatented May 8, 19(16.

Application filed August 12,1904. Serial No. 220,446.

To all who? it may concern:

Be it knownthat Ye/HENRY IIELLMAN and LEWIS QON LOI BAYLEs, citizens of the United States," residing at Johannesburg, Transvaal, haveinvented certain new and useful Improvements in Rock-Drills or Book- Drilling Machines, of which the following is'a specification.

Our invention relates to a rock-drilling machine or engine designed to operate or perform its several functions automatically.-

A machineconstructed as hereinafter described does not require constant attention or supervision on the part of the operator. The rotation of the drilling bit or tool and the feeding of the machine being both automatic, once the machine is started the opera tion is continuous so long as the drill orbit can strike or come into contact with the rock.

When the machine has reached the limit of its range of feed, it isautomaticallyput out of operation, so that no injuryresults to the machine;

The present improvements have reference, first, to means for ,mounting the machine or engine and for adjustably mounting or'securing the protecting-casing in a supportingsleeve;- secondly, to means for conducting and admitting the actuating or operating fluid to the powercylinder;-thirdly, to means for automatically feedin the machine or engine or for traversing it longitudinally of its supporting and protecting casing; fourthly, to means for automatically imparting an intermittent rotary motion to the power-cylinder, and with it the drilling-bit or cuttingtool; fifthl-y, to means for transmitting the repeated impacts of the reciprocating percussive member of the machine or engine to the drill or bit sixthly, to means for conduct-.

ing a quantity of the operating fluid to or: in

proximity to the cutting extremity of the drill or hit to assist inthe expulsion of the rock-cutting from between the cutting edges of said tool and the rock-face or the bot'tom' of the hole being drilled and also for preventing the overheating of the drill or hit and that part or those parts which receive and transmit the impacts of the reciprocating percussive member to the drill or bit, owingto' thesudden expansion of the fluid in its passage through or along said part orparts seventhly, to means for fornnn' and directin around the mouth of the ho e being drille a-fspray or sprays of water or other liquid which by contact with the particles of rock as they emanate from the hole and by saturating and moistening the same cause them to settle and prevent their being disseminated in the surrounding atmosphere, and, eighthly, to the general construction and arrangement of the machine or engine, as hereinafter described, and more particularly pointed out in the appended claims.

In order that our invention may be the more readily comprehended, we append an explanatory sheet of drawings, which is marked with figures of reference correspondin to the following description thereof.

In the drawings, Figure 1 represents a longitudinal section of the protecting-casing, showing the machine or engine in situ and in part longitudinal section; Fig. 2, a transverse section on line a: as, Fig. 1; Fig. 3, a transverse section on line y y, Fig. 1. Fig. 4 is an enlarged view of the rear end of the power-cylinder and its attachments, partly in section. Fig. 5 is a transverse section on line a; y, Fig. 4. Fig. 6 is a transverse section, on line 2, Fig. 4.

In the accompanying drawings we illustrate the several improvements adapted to a machine or engine in which the admission of the actuating or operating fluid alternately to either end of the power-cyhnder or either side of the piston or equivalent reciprocating. V

percussive member is controlled bymeans of a valve; but we would here remark that these improvements maybe readily adapted to a machine or engine designed to operate without a valve-that is to say, to a machine or engine in which the piston or reciprocating percussive member itself controls the ad mission of the operating fluid and the distribution thereof in the power-cylinder.

In the specification of a prior application for Letters Patent filed by us on the 31st day of May, 1904, bearing Serial No 210,519, we

describe an arrangement for mounting or securing the protecting-easing 1 for the power or drill cyhnder 2, which consists of a split sleeve, to which' is attached the cone or equivalent device 3 for clamping it to a column-bar or other support.

Now according to our present invention we employ a solid sleeve 4, which, as shown in the drawings, carries thecone 3 lnplace 'of the cone wem'ay use any othervsuitablev construction for the purpose-of clamping or securing it in position. The sleeve i'is constructed to form a recess on the inside, in

which recess 5 is arranged a gib or pad 6, which rests on the top of the protecting-casing 1. In the sleeve 4 above the pad 6 is formed a hole 7, which is formed with anvinternal screw-thread, through which hole 7 is screwed a set-screw 8. The inner end of the set-screw 8 abuts or engages the topof the gib or pad 6, so that by screwing down the screw 8 the gib 6. is forced downward and the protecting-casing thereby secured between the inner surface of the pad or gib 6 on the one side and the inside of the sleeve 4 at the opposite side. It will be evident that more than one of the set-screws 8 may be used, if desired, and that the gib 6 may be dispensed with, in which latter event the set screw orscrews8 would come directly into contact with the outside of the protecting-casing 1 inside the sleeve 4. By screwing outward the set-screw 8 and releasing the gib 6 the rotecting-casing 1 may be slid longitudinal yin either direction in the sleeve 4, after which it maybe securely clamped by screwing down the set-screw 8 orscrews, as previously ex-' plained.

v The proteotingecasing 1 is at the one end fitted with a bush orcap 9, which constitutes the guide in which the'drill-cylinder 2 is slidand the other end is fitted ably supported,

' with a cap or cover 10, which constitutes the rear guide for the drill-cylinder 2, through which slides a pipe 11, which serves for conducting the compressed air, steam, or other gaseous fluid into the drill-cylinder 2.

In order to render the feeding of the machine automatic, we provide means for admitting a supply of the operating fluid to the interior' of theprotecting-casin 1. To this end the forward guide 9 is fitted with a cup leather 12, and in the rear guide 10 is fitted a similar cup-leather 13, which cup-leathers 12 13 are provided to prevent the escape of the operating fluid from the protecting-casing 1.

P Instead of on -leathers we may use any other form of pac ng suitable for this purpose. With this arrangement the exhaust port or orts (indicated at 14) are formed in the walls of the drill-cylinder 2 in such away that they open or exhaust through the forward end of said cylinder 2 and outside the protecting-casing 1.

; The pipe or hollow bar 11, which, as previously explained, serves for conducting the operating fluid mto the valve-box 15 at the rear end of the drill-cylinder 2, (see Fig.- 4,)

is made'ofsquare section externally, and the hole in the rear guide 10, through which it works, as also the cup-leather or other packing 13 fitted therein, are made of corresponding shape, so that the operating=fluid-supply ipe 11 is incapable of rotating in said rear guide 10. The rear extremity of the pperatsuitable manner wit conducted to the pi that may lea cylinder 2 in the event of the drill or hit not piece.

shank cap-piece referred to incur prior application, Serial No. 210,519, and said extension 18 being formed in one piece with the drill-bit-holdihg device 17 transmits the repeated impacts to the drill bit or tool19. Theoperatin fluid is admitted to the front of the drill-cfiiuder 2 along the inlet-port 20 vfor effecting the back and idle stroke of the piston, and 21 is a port which by permittin the free esca e. of any of the operating flui iifrorn the supIply-port 20 round the piston prevents such eakage reversin the piston when the latter moves forwar and drives the extension 18 forward in the coming into contact with the rock or bottom of the hole beingdrilledr This action is de scribed in our rior application above referred to in con unction with the shank cap- To provide for the admission of the operating fluid to the protecting-casing 1, a port 22 isformed in the drill-cylinder 2 between the inlet-port 20 and the escape-port 21, which latter port 22 is produced in a rearward direc- 1 oo tion through the walls of the-cylinder 2 and communicates with the interior of the protecting-casing 1 at the rear end of'the drillcylinder 2, as is indicated at '23 in Fig. 1.

This port 22' is fitted with a check-valve 24, 1 5

which is kept on its seat by means of a sprlng and screwed lug screwed into the drill-cylinder 2 from t e outside.

withior close to the rock, the piston-at the end operating fluidthen passes along it and es: capes at 23 into the interior ofthe protectingcasing 1, and being unable to esca efrom said casing 1 said fluid moves the -cyl inder2.

forward with a force equal to the pressure, 120

multiplied by the difference between/the areas of the openings in the front and rear guides or the sectional areas of the drill-cyliner 2 and operating-fluid-sup 1y pipe 11, re-

s ectively. The admissiono thei'operating :25

uid to the protecting-casing '1 thus moves the drill-cylinder 2forward in the rotecting- 1 casing 1, so that when the dr" orbit 19 comes in contact with the rock it causes the); dnll b1t ho1dingdev1ce17 and the 'ex tension, 1 0

This arrangement, operates to admit the operating fluid to the protecting-casing 1 in the following manner: 1 1o- Should the drill or bit 19 not be in contact -18 to be pushed backward in the cylinder 2 until the latter covers and closes the port 22, whereupon said port remains closed until such time as the drill or bit 19 has penetrated the rock sufficiently far to again push the extension 18 forward to a ain uncover the port 22, when the above cycTe of operations is repeated. If desired, a petcock (shownat ig. 1) may be fitted in any convenient position on the protecting-casin 1 to be operated by the operator when it is esired to permit the operating fluid to escape fromthe protecting-casing l. 'as, for instance, when he desires to move the drill-cylinder 2 backward in order to insert a longer drill or bit.

We will now describe the means'we employ for imparting to the drill-cylinder 2, and with it the drill or bit 19, the intermittent rotary motion. As previously explained, the operating-fluid-supply pipe or hollow bar 11 is made of square or of a suitable polygonalsection externally, and the aperture in the rear guide 10, as also the packing 13 fitted therein, through which the bar or pipe 11 reciprocates, are constructed to correspond. The forward extremity of the hollow bar or pipe, 11 (see Fig. 4) is reduced to form a 1101- low cylindrical projection or extension 25, by

' which the motive fluid is conducted into the valve-box 15. The endof the extension 25 is formed with a screw-thread, which projects for a short distance into the valve-box chamber 15, and screwed over the inner end thereof is a nut 26, by which the pipe 1 1.is revolubly connected to the valve-box 15. The feed-pipe or hollow bar 1 1 is constructed with an annular projection 27, provided with a flange 28, which forms an annular recess 29 between said flange 28 and the. rear end of ternately to either end of the drill-cylinder 2 and reciprocating piston. previously explained, the valve (not shown inthe draw mgs) operates ma manner well understood to alternately admit the motive fluid alongthe. ports 20 33. At the rear of the valve-box.

cap 31 is located aring or disk'34, whichis fixed, by means of screws or otherwise, to the rear. end of the valve-box. The extension 25 fluid from the drill-cylinder 2 to the several compartments or chambers 37. for operating of the hollow feed-bar 11 is free to 'rotate in a hole at the center of'the disk 34, through which it projects. Arranged next the disk 34 is what we may designate a small oscillating motor, which com rises a hollow cylinder 35, attached to the disk 34 or to the valvebox or valve-box cap 31, the hollow cylinder 35 being fenned with the, internal radial shaped wings 36, which betweenthem form.

the radial chambers or compartments 37 and a device consisting of a hub 38,1nountedconcentrically on the extension 25 of the hollow. feed bar or pipe 11, which hub 38 is formed with radial vanes or blades 39, whichvproject into the'radial compartments or chambers 37, formed between the adjacent wings 36.

The vanes or blades 39 are constructed so that they are capable of oscillating in the compartments 37 between the adjacent wings 36, and the vanes or blades 39 are 'constructed so that at their outer ends they make a comparatively air-tight fit with the interiorof the cylinder 35 The'inner ends of the wings 36, which abut the hub 38 between the radial vanes 39, are also constructed to make a comparatively air-tight fit with the hub 38. The rear end of the hub 38, carrying the vanes 39, projects into the annular recess 29, formed round the cylindrical extension 25 by theflange 28 on the feed bar or pipe 11. Round this portion of the hub 38 are formed ratc hetteeth 40. The

inside of the flange 28 is constructed toxform bearings or pivots 41 for three (more or less) pawls or catches'42, whicheng'age the teeth 40. These pawls 42 are maintained incontact with the ratchet-teeth 40 by means of the three (more or less) springs 43. Round thehub 38 and between the inner edge of the flange 28 and rear end of the cylinder 35 is arv ranged a cylindrical or cup-sha ed piece consisting of the disk or ring 44, ormed with a flange orrim 45. This cup-shaped piece is attached, by means of the screws 46, to the wings 36. (See Fig. 5.) The two rings or disks 44 and 34, forming the ends of the several chambers 37, form an air-tight fit with the ends ofthe vanes or blades 39 and the wings 36. The flange or rim 45 on the ring or dlsk 44 incloses an annular space round the ratchet-teeth 30, formed on the flange 28, and

inside the rim 45 are located three (moreor less) awls or catches47, whicharemamtaine in engagement, with the ratchet-teeth 30, on the flange28 by means oi the springs 48.

49js. a ring which'is arranged next andattached toQthe flan e, 45 and round the flange 28 in such a way t at it incloses the annular space formed by the flange 45 round the ratchet-teeth 30'. -.The pawls-47 are seated in recesses formed on the inside of the flange 45, and they ma be provided with cylindrical 'projections or 1 ivots 50,-. hich project into recesses 'forme in'th'e rings 44 and 49. For the purpose of con-vevmg the motive the motor two annular recesses 51 52 are Formed inside the valve-box cap 31 at the front end, and 53 is a port 'plac' the annu lar recess'51 in communication with the su 1y port 20, which commumcates-witht e orwardend of the cylinder. 2. The-other.

annular recess 52 is placed in communication, through the port 54, with the supply-port 33 for the rear end of the cylinder 2. In the disk 34 are formed a number of apertures '55, which communicate in pairs with the chambers 37 at opposite sides of each of the vanes 39. The several apertures 55 serve for placing the supply-port 33 in communication with the compartments 37' at corresponding sides of each of the several vanes 39, while the other apertures 56 serve for placing said compartments 37 in communication with the supply-port for the other end of the cylinder 2. In the valve-box cap 31 and formed longitudinally thereof are ports or passages 57, which place each of the several apertures 55 in thedisk 34 in communication with the annular recess 52, and 58 represents corresponding ports or passages placing each of the several apertures 56 in communication with the other annular recess 51. It will now be understood that as the valve operates to admit the operating fluidalternately along the ports 33 and 20 to the rear and front end of the cylinder 2 the operating fluid is alternately admitted to the compartments 37 on opposite sides of the vanes 39 ,and that as the supply-ports 33' and 20 are in like manner alternately opened to exhaust the several compartments 37 are in like manner alternately opened to exhaust at'opposite sides of the vanes 39.

The operation of'the mechanism will now be readily understood and may be described as follows: When the operatingfluid is admitted to the front end of the drill-cylinder 2 along the'port '20, the fluid passes through the ort 53 into the annular recess 51, whence through the apertures ows along the ports or passages 58 56 into the compartments 37 between the wings 36 and the vanes 39'. The expansion of the fluid inside the several compartments'37 rotates the motorcasing or cylinder 35, and with it the valvebox 15, valve-box cap 31, drill-cylinder 2, and'dril1-bit'19, the several vanes 39 being held stationary by means of the pawls, 42, lo-

cated in the flange 28, formed on' the-feedpipe 11. During this movement of the motor-casing the compartments 37 at the other side-of the several vanes 39 are opened to exhaust through the supply-port 33' and valve.

. During this rotatory movement of the motorcasin the pawls 47 pass freely over the.

ratch t-teeth 30, formed on the outside of the 28 on the feed-pipe 11, and when the rotary motion stops the pawls 47 engage the teeth 30 and prevent any rotatory motion of the cylinder 2 1n the reverse direction. When vtheoperating.fluid is admitted to the rear end of thecylinder2 and the. front end-of the cylinder i'sopen to exhaust, the fluid then passes along the port 54 into the annular'recess 52 in the valve-box cap 31, whence it flows along the ports or passages 57 through the aperdrill-cylinder 2. The

. drill-bit holding device 17 purposes side of the several vanes 39. This ro- 7 then again admitted to the ront end of the cylinder 2 and the above cycle of operations is re eated.

though we describe and illustrate a particular form of motor for imparting the intermittent rotary motion to the drill-cylinder and drill-bit, it will be obvious that it may be of any other suitable construction ada ted to impart the desired motion to the dril -cylin der and bit by means of the operating fluid employed for operating the-machine.

In a recess 59, formed in the flange 60 at. the-rear end of the cylinder 2, is located a catch or detent 61, which engages recesses, catches, teeth, or projections 62, 'formed round the inside, of-the cap 31. This catch 61 serves to prevent the unscrewing of the cap 31 ofl the end of the drill-cylinder 2. To unscrew and remove the cap31, the catch 61 is pushed into the recess 59 in the flange 60 against'the small spiral spring 63.

To insure the synchronous movement of the chuck or drill-bit holding device 17 with the power cylinder 2, two longitudinal grooves or feather-ways 64 are formed diametrically opposite each other in the bore of the cylinder 2 atthe front end, and in two grooves or recesses formed diametrically opposite each other in the extension 18 are fitted two feather-keys 65, which project into the grooves 64, formed in the bore of the feather-keys 65, being free to slide in the feather-wa s '64 in the bore of the cylinder 2, allow t e longitudinal movement of-the extension 18 and drill-bithOlding device 17, While compelling them to rotate n unison with the drill-cylinder 2.

As reviously explained, the' chuck or is formed in one piece with the extension 18, which latter is projected into the bore of the cylinder.- In the construction illustrated said chuck 17 is an ordinar taper chuck and is formed with a taper ho e in the front, into which is projected the ta ered shank of the drill or bit 19. 66 is a, driftway formed transversely of the chuck 17 for the insertion of a drift to dis-.

place the drill or hit 19 when necessary;

.We-provide for the passage through the extension .18 and into the chuck 17 and from the chuck 17 along the drill or bit 19 to or in proximity to the cutting end thereof of a uantity' of the operating fluid from the dri l-cylinder'2. The passage of this operating fluid through these parts serves the dual of keepingthe extension 18 (which receives the impacts. of the whim-coating piston) cool and prevents it bifidingor cutting the cylinder 2 at the rear of said extension 18.

tant advantage, particularly in the d The longitudinal hole 67 is preferably increased'm area after it has entered the ex tension 18 for a short distance, so that as the operating fluid passes along or through said.

extension it is ca able of expanding freely to rcvent the overll nside-the'chuck 17 and surrounding a ortion of the shank of the drill or bit 19 w en the latter is projected into it is formed an an nulal: recess 68. The hole 67, formed longitudinally of the extension 18, is placed in communication with the annular recess 68 inside the chuck by means of two ports or passa es 69 70. These two ports 69 70' are.

drille through the chuck 17 and the outerends are closed by means of plu s, so that the operating fluid is compelle to pass through the ongitudinal hole, 67 along the ports 69 70 into the recess 68. The ports or passages 69 7 6 are formed in the chuck 17 in the manner shown in order to avoid the cotter'or drift hole 66. A hole 71 is formed longitudinally of thedrill 01' bit 19 for conducting the operating fluid to or in roximity to the cutting extremity. This ongitudinal hole 71 is placed in communication with the annular recess68 inside the chuck 17 by means of a transverse hole-7 2, formed inthe shank of the drill or bit 19. It will be understood that the assa' e of the o' erating fluid through the dril or it 19 ten' s to keep the cutting extremity 0001, which is an irrrlilporling of upwardly-inclined and dry holes, as it ordinarily becomes so much heated as to materially impair the durability of the steel.

In the forward end of the drill-cylinder 2 is screwed or otherwise secured the front head 73, .in which is sup orted and reciprocates the extension 18 of t e drill-chuck 17.

For the purpose of forming'and directing aroundflthe mouth of the hole .a spray or sprays of water we prefer to employ the operating fluid exhausting along the port 141to the f; out of the cylinder 2; With this object an annular groove 7451s formed in the end of the drill-cylinder 2, with which said exhaustport 14- communicates. In a flange formed roundathe front head 7 and on the inside is, formed an annular groove 75, which when the fronthead 73 is in position in the cylinder 2 coincides with the annular groove 74. Formed longitudinally of the front .head. 73 are four (more or-less) ports or passages 76, which open to the font of the front head 73 and, as illustrated, preferably diverge in the direction of the front of the machine or are inround the mouth of the hole.

eating of the extension 18..

clined outward, so as to cause the sprays to encompass a larger area of the rock-face These severalports or passages 76 communicate at the other end with the annular groove or recess 75. Round the front head 73 inf ont of the flange is arranged a swivel or swivel-piece 77,

which is constructed with an internal annular recess 78. This recess 78 is laced in communication with the longitudinal ports-75 or passages 76 by means of the transverse ports or passages 79, formed in the front head 73: It will now be perceived that the several longitudinal ports or assages 76 are placed in communication wit theexhaust-port 14 by means of the annular moves 7 4 75 in the end of the cylinder 2 an front head 73, respectively, and that these several ports or passages 76 are also placed in communication with the annular recess 78 in the swivel 77. The swivel 77 is formed with a nipple or branch 80, to which is attached a' water or other liquid supply pipe 81. The water passe'slfrom the pipe 81 through the hole '82 in theni ple into the annular recess 78 in theswivel 7 7.- The pipe 81 communicates with a source of supply of water or liquid under pressure. The action of this arrangement is as follows: The exhaust fluid passing along the exhaust-port 14 enters the ongitudinal .ports or assages 76 at the inner end, and the water eiug. admitted to said passages 76 through the ports 79 from the swivel 77 the water comnnlngles with the ex-' haust fluid and issues from the passages 76 at the front in the form. of a spray, as is To maintain the swivel 77 in position round the front head clearly illustrated'in Fig. 1.

73,.the forward end of the latter is provided with a screw-thread, over which are screwed the locknuts 83.

Instead of usin the exhaust fluid from the machine it Wil be evident that the fluid could be used-at the initial pressure.'

What we claim as our inventidn, and desire to protect by Letters Pat'ent,

l. A rock-drilling machine or en ine, con:- p. ising a power-cylinder, a drill or it operatively carried by.the cylinder, connections for imparting rotary movements of the cylinder tothe bit, and a motor carried by and rotatin'g said cylinder. v

. 2. A rock-d1 illing machine or engine comrising a' protecting-casing, a power-cylinder oused within the casing, a dull orbit opera;

tively carried .by said cylinder, connections for imparting the rotarymovements of the cylinder to thedrill or bit, and a motor car-r ried by the cylinderand -housed within the casing for rotating said cylinder.

3. -A rock-d1 illing machine or engine, comprising a power-cylinder, a di ill or bit operatively carried by said cylinder, "connections for imparting the rotary movements of the cylinder to the drill orbit, a motor car] ied by cillatin and rotating said cylinder, and means carried by the cylinder for admitting motive fluid to the motor.

4. A rock-drilling machine or engine comprising a power-cylinder, means arranged in the front end of said power-cylinder for carrying the drill or bit, said means permitting t e drill or bit .to move longitudinally of the power-cylinder while compelling it to rotate in unison therewith, an oscillating motor carried by said power-cylinder, means for introducing the o erating fluid to said cylinder, and means or admitting the fluid to the motor to rotate the power-cylinder-and with it the drill or hit. v

5. A rock-drillin machine or engine comprising a power-y inder, means located at the front end of sald cylinder for carrying the drill or bit and for com elling said drill or bit to rotate in unison wit said cylinder, an osmotor carried by said cylinder,

-means or introducing the operating fluid to said cylinder and meansfor admitting the :operating fluid to the motor to rotate the power-cylinder and drill-bit part of a revolution during the return stroke-of the reciprocating percussive member and for permitting movement of said -motor without efiecting rotation'of the cylinder on the forward stroke of said reci rocating percussive member.

Y 6. A roc -drillin machine or engine comprising a power-cylinder, a drill or bit oper-' atively carried by saidower-cylind er and means for compellin said drill or bit to rotate in'unison with t e cylinder, an oscillating motor carried by said cylinder comprising a member connected withsaid power-cylincylinder, means for permitting said discon- .4o

der and a member disconnected from saidnected-member of the motor to rotate freely in one direction while preventing it rota-tin in the opposite directlon so that the fixe member 1s compelled to rotate and carry with i it the power-cylinder and drill or bit, and

' prising a power-0y inder, a drill or bit operativelycarried by said powercylinder,.means 'means for introducing the motive fluid to the power-cylinder and motor.

.7. A rock-drillin machine or engine comfor compellin said drill or bit to rotate in unison with t e power-cylinder,an oscillating motor carried by said cylinder comprising 3 a member connected with saidcylinder, and a tween sald' nected mem member disconnected from said cylinder, a' pipe for in roducing the operating fluid to sald cylinder, means for preventing-rotation of said pipe. pawl-and-ratchet mechanism beipe for preventing the disconber of the motor from rotatingv in one direction so that the other member of the motor is compelled to'rotate the cylinder and drill orbit, and pawl-arid-riatchet mechanism between said p'ifpe and the connected member of said motor or preventing the connected member from moving when the disconnected member is moved.

8. A rock-drilling machine or engine comprising a power-cylinder, a support in which said cylinder is slidablymounted, a drill or bit operatively carried by said power-cylin der, means for compelling said drill or bit to rotate in unison with the power-cylinder, an oscillating motor carried by said cylinder comprising a member connected with said cylinder and a"me'mber disconnected from said cylinder, a pipe for introducing the operating fluid to said cylinder, means for preventing rotation of said pipe, pawls carried by said pipe engaging ratchet-teeth formed on the disconnected member of the motor and pawls carried by said -connected member engaging ratchet-teeth formed on the pi e' so that when the disconnected member 0 the motor is held stationary the connected member and with it the cylinder and drill-bit are rotated, and when the connected member and with it the cylinder and drill-bit are held stationary the disconnected member is 'free to rotate substantially as described. I

9. A rock-drilling machine or engine comprising a power-c llnder, a support in which said cylinder is s idably mounted, a drill or teeth formed on the disconnected member of the motor and pawls carried by the connected member ofi'the motor engaging the ratchetteeth on the pipe so that whenthe disconnected member of the. motor is held stationary' by the pipe the connected member, cylin- I 1 Hail; are rotated part ofa revoluder and dr tion 'andso that the disconnected memberis free to rotate to allow the connected mem ber, cylinder and bit to remain stationary,

substantially as described. r p 1 0 "In a rock-drilling machine or engine, a power-cylinder carrying thepercussive a paratus, a drill or bit operatively carrie by said cylinder in. such'mann erthat the drill or bit is compelled to rotate in :unison with the cylinder, an oscillating motor carried by said cylinder comprising a member connected to 1 said cylinder and a member disconnected therefrom, means for alternately admitting the operatin fluid to either end of said-cylinder-and at t e same time for admitting the fluid to the oscillating motor, a pipe for introducing the operating fluid to said cylinder and means between said pipe and the two members of the motor for permitting'the free movement of the disconnected member and for preventing the rotation of said disconnected member and ermittin the connectedmember and with it the dri l-cylinder and drill-bit to be rotated, substantially as de- .scribed.

with a flange provided With ratchet-teeth,

pawls carrie by said flangeengaging ratchetteeth formed on the disconnected member of the motor for permittin said member to ro tate in one direction on y, pawls carried by the other member of the motor which is connected to the 'ower-cylinder for preventing said connecte member'from rotating in one direction while permitting it to rotate in the reverse direction substantiafly as described.

12. In a rock-drilling machine or engine in combination, a power-cylinder, a drill or bit operatively carried by said cylinder, means veither end of sai for compellingsaid drill or hit to rotate in unison With said cylinder, means carried by said cylinder for alternately admitting the operating fluid to orts communicating with c linder, an oscil ating motor connected Wit and carried by said .cylindercom risin a-member attached to said cylinder orme :with a plurality of radial wings and a disconnected member formed with a plurality of radial vanes working in the compartments formed between said radial wings, ports placing said compartments in communication with the main supplyports at opposite sides of said radial vanes so that as the main sup ly-iportsare each alternately opened to a mit the operating fluid and to exhaust said compartments at opposite sides of the radial vanesare in like manner alternately opened to admit the operating fluid and then toexhaust, means for introducing the operating fluid into the cylinder and means for preventing the rotation of the disconnectedmember of the motor while permitting the rotation of the member connected to the cylinder and alternately for preventing the rotation .of the connected member and permitting the rotation of the discon-- nected member, substantially as described.

13. In a rock-drilling machine or en 'ne, in combination a power-cylinder, a dril 0r bit operatively carried by said power-cylinder,

means for compelling said drill or bit to rotate 1n unison with said cylinder while permitting it to move longitudinally thereof within certain limits, a support in which said a cylinder is slidably mounted, a pipe for introducing the operating fluidto said cylinder said pipe being revolubly connected to said cylinder, means for preventing rotation of sald plpe, said pipe being constructed with a cylindrical extension and with an annular projection and flange formed with external ratchet-teeth and constructed internally to form bearings for a plurality of pawls, a cap arranged on the rear end of, said cylinder, means located in said cap for alternately admitting the operating fluid to either end of said cylinder, an oscillating motor comprising a member fixed to said cap and cylinder and a member disconnected therefrom mounted on the extension on the feed-pipe'next the cap, chambers formed in said connected member in which vanes formed on the disconnecte'cl member oscillate, orts formed-in the cap placing the main supp y-ports in commu'- nication with said chambers at opp nsi'te sides of the several vanes, spring-controlled pawls carried by the connected member. in gear with the ratchet-teeth on the flange on the operating-fluid-supply pipe and "spring-controlled pawls carried on the inside'of said flan e in gear with the ratchet-teeth for-med on t e hub of the disconnected member to permit the disconnected member to rotate in one direction and to prevent it moving in the reverse direction so that the connected member is compelled to rotate part of a revolution and carry with itthe power-cylinder and drill or bit, substantially as described.

'14s In a rock-drilling machine or engine, in combination, a powercylinder, carrying the percussive apparatus, a cap screwed on the rear end of saidcylinder, means located in said ca for alternately admitting the operating uid to either end of said cylinder, means for preventing the rotation of saidcap consisting of a spring-controlled catch or deatent located in a recess formed in a flange at the rear end of said cylinder, said catch engaging teeth or indentations in the front of said cap, substantially as described. 1-5. In a rock-drilling machine or engine, in combination, a power-cylinder carrying percussive apparatus, a protecting-casing, uides fitted in said casing and in whichtlie cy inder is slidably mounted and supported, packings located in said guides for preventing the escape of the operating fluid, a supplyp1pe pass"-'- ing through said uides' and packings and communicatin wit the cylinder,'for admit-" ting operative uid thereto,'and means for admitting a quantity of the operating fluid to the protecting-casing when thedrill or "bit does not come into contact withthe' rock-or the bottom of the hole being drilled.

161 In a rock-drilling machine or engine, in

combination, a power-cylinder carrying the percussive apparatus, a protecting-casing, guides fitted in the ends of said casing in which the cylinder is slidably mounted and supported,-packings located in said guides for preventing the, escape of the operating fluid through said guides, means arranged at the forward end of the cylinder for carrying the drilling bit ,or tool said means operating ,to

admit a quantity of operating fluid ,to 'the protecting-casing in the event of the bit or tool not striking the rock;

17.. In a rock-drilling machine or engine, in combination, a power-cylinder carrying the percussive apparatus, a protecting casing, guides fitted in the ends of said casing in which thecylinder is slidably mounted and supported, packings located in said guides for preventing the escape of the operating fluid ides, means arranged at the through said forward end 0 the cylinder for receiving and transmitting the impacts of the reciprocating percussive member to the drill bit ortool, said means controlling the admission of a quantity of the o crating fluid to the protecting-casing to fee the drill when the'bit or tool does not come into contact with the rock or bottom of the hole being drilled.

18. In a rock-drilling machine or engine in combination, a power-cylinder carrying the percussive apparatus, a protecting casing,

' guides fitted 1n the ends of said casing in hausting into the which the cylinder is slidably mounted and supported, packings located in said guides for preventing the escape of the operating fluid through said guides, means arranged at the forward end of the cylinder for receiving and transmitting the impacts of the reciprocating forming guides fitted at either end of said pro tecting casing, packings arran ed in said guides for preventing the escape'o the operating fluid from said. casing, a drill-bit-holdin device formed with an extension projecte into the front end of the power-cylinder said extension serving to receive and transmit the impacts of the reciprocating Lpercussive mem-. herto the drill bit or tool an for admitting a quantity of the operating vfluid to the inter or of the ,casingwhen said extension 'is driven forward by the reciprocating percussive member owingto the drill or bit not coming into contact with the bottom of the hole-being drilled, substantially as described I 20. In a rock-drilling machine or engine, in combination, a power-cylinder carrying the reciprocating percussive member, said cylin- 'der being formed with a port for conducting a quantity of the operating fluid to the forward end of said cylinder, means arranged at the forward end of said cylinder for carryin the drill bit or tool, a front head fitted to the ont end of said cylinder, ports or passages formed in said front head communicating with the port along which the operating fluid is conducted to the front of the machine and means for introducing water or other liquid to said ports or assages to commingle with the operating uid to form a spray or sprays which are directed around the mouth of the hole,

substantially as described; i

21. In a rock-drilling machine or engine, in combination, a power-cylinder formed with a port leading to the front end thereof which forms the exhaust-port and with an annular 'recessin the end thereofin communication with said port, a front head fitted to the forward end of said cylinder formed with an .annular recess coinciding with the recess in the end of the cylinder,a plurality'of ports or passages formed in the head diverging or inclined outward, and means for also conducting a quantity of water or other fluid to said ports or passages,"substantially as described.

'22. In a rock-drilling machine or engine, in

combination, a power-cylinder carrying the reciprocating percussive apparatus a pr0- tecting-casing in which said cylinder is slidably mounted, a sleeve ,for adjustably supporting said casin a front cover for said casing forming a gui e for said cylinder, a pack- 1 ing for preventing the egress of the operating fluid from said casing between said guide an cylinder, a fluid-supply pipe connected to the rear: end of the cylinder for conducting the,,

motive fluid thereinto, a cover forming a guide and support for said operating-fluidsupply pipe andthe rear end of the cylinder, a packing in said guide for dpreventing the egress of the operating flui between said guide and pipe, an oscillating motor arranged at the rear end of said cylinder for rotating said cylinder part of a revolution duringthe rear or return stroke of the reciprocating percussive, member, means for controlling the admission of the operating fluid-to either end ofv said cylinder said means operating tofcontrol the admission of the fluid to said motor means forreceiving andtransmitting the -im-- pacts of the reciprocatin percussive member tothe drill bit or tool sai .means operating to admit a quantity; of theoperatingfluid tothe protecting-casing in the-event of thedrill-bit not coming into contact with the rockto automatically feed theidrillfforward, meansfor compe'lling the'drll'l or bit to rotate. in unison :with {the power c linder,means for conduct-F ing aquantit o the operating fluid 'to' the cutting end o said drill orbit and means for producing and directing sprays of water or other liquid round the mouth of the hole being drilled, substantially as described.

23. In a rock-drilling machine or engine, a power-cylinder, a pro tecting-casing surroundmg the cylinder and having a forward head through which the cylinder slidably and rotatably projects, acking fitting between said head and cylinc er, a tubular motive-powersupply portion rotatably connected with the power-cylinder and extending rearwardly therefrom and slidably and non-rotatably passing through a rear head of the casing, and packing between the exterior of said tubular non-rotatable portion and the rear 7 head.

24. In a rock-drilling machine or engine, a ower-cylinder, a protecting-casing surroundthe cylinder, and having a forward head 20 through which the cylinder slidably and non-rotatably tween said head and cylinder, a tubular motive-power-supply portion rotatably connected with the power-cylinder and extending rearwardly therefrom and slidably and nonrotatably passing through a rear head of the casing, and packing between the exterior of said tubular non-rotatable portion and the rear head, in combination with a solid sleeve wherein the casing is slidably mounted, and provided with means for locking the casing within the sleeve.

' In witness whereof we have hereunto set our hands in the presence of two subscribing rejects, packing fitting be--' 

